The Apple Watch is already crushing the competition, according to new study

The Apple Watch officially went on sale less than six months ago, and it’s already the second most popular wearable device on the market.

A new survey from the International Data Corporation (IDC) estimates that Apple shipped 3.6 million Apple Watches in the second quarter of 2015, putting it right behind Fitbit, which is estimated to have sold 4.4 million total units and has been selling wrist-worn fitness trackers since 2013.

The IDC’s findings also suggests Apple shipped more units of its smartwatch than Xiaomi, Garmin, Samsung, and other gadget makers had of their respective wearables in the second quarter of 2015.